Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 145gr | Speer Grand Slam bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Winchester StaBALL HD.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 57,638 psi | 90% | 3025 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,955 psi | 86% | 3002 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 55,216 psi | 87% | 3117 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 94% | 56,101 psi | 88% | 3114 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 56,086 psi | 88% | 2966 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,941 psi | 88% | 3058 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 57,305 psi | 90% | 3117 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,979 psi | 75% | 2940 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,873 psi | 67% | 2894 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,464 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,840 psi | 88% | 3061 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,087 psi | 89% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,288 psi | 87% | 3041 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,203 psi | 90% | 3114 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,723 psi | 86% | 3035 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3087 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,984 psi | 86% | 3120 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 56,347 psi | 88% | 3097 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,096 psi | 79% | 3018 fps | 97.7% |
| Bofors RP5 | <<locked>> | 96% | 57,203 psi | 90% | 3114 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 57,711 psi | 90% | 3009 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,055 psi | 83% | 3038 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 86% | 56,739 psi | 89% | 3058 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 55,796 psi | 87% | 3012 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 57,450 psi | 90% | 3058 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,159 psi | 88% | 3035 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,086 psi | 88% | 2982 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,968 psi | 83% | 3153 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 86% | 57,566 psi | 90% | 3097 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,014 psi | 58% | 1906 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,608 psi | 87% | 2989 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,550 psi | 87% | 2976 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 55,405 psi | 87% | 2995 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,868 psi | 86% | 2982 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 96% | 55,187 psi | 86% | 3094 fps | 98.1% |
| Lovex S065 | <<locked>> | 86% | 56,014 psi | 88% | 2972 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,711 psi | 90% | 3018 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,824 psi | 86% | 2982 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 56,594 psi | 89% | 3045 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 38,305 psi | 60% | 2812 fps | 96.3% |
| Norma MRP | <<locked>> | 94% | 57,174 psi | 90% | 3136 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 57,087 psi | 89% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,970 psi | 88% | 3117 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 55,999 psi | 88% | 3045 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,070 psi | 85% | 3045 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,826 psi | 59% | 1949 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,797 psi | 89% | 3068 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,998 psi | 86% | 3025 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,421 psi | 90% | 3117 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,693 psi | 84% | 3153 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 55,390 psi | 87% | 2956 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,188 psi | 90% | 3028 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 54,824 psi | 86% | 3031 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 57,711 psi | 90% | 3009 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,014 psi | 88% | 2972 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,711 psi | 90% | 3018 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,913 psi | 89% | 3015 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,230 psi | 87% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,506 psi | 87% | 2927 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,389 psi | 85% | 3028 fps | 98.9% |
| Somchem S355 | <<locked>> | 82% | 54,969 psi | 86% | 2946 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,245 psi | 87% | 2959 fps | 97.4% |
| Somchem S365 | <<locked>> | 90% | 57,609 psi | 90% | 3045 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,405 psi | 87% | 3005 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 56,318 psi | 88% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,245 psi | 87% | 2979 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,027 psi | 86% | 2986 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 86% | 54,433 psi | 85% | 2982 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,058 psi | 89% | 3061 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,029 psi | 89% | 3130 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 3104 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,984 psi | 86% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,971 psi | 89% | 3061 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,173 psi | 88% | 3173 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,477 psi | 87% | 3002 fps | 98.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 33,344 psi | 52% | 2552 fps | 95.9% |
| Accurate 4350 | <<locked>> | 80% | 44,788 psi | 70% | 2825 fps | 99.8% |
| Accurate High Country | 67.4 gr | 86% | 44,788 psi | 70% | 2913 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 90% | 48,631 psi | 76% | 2979 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 52,852 psi | 83% | 2913 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,001 psi | 63% | 2749 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 88% | 43,801 psi | 69% | 2861 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 98% | 45,034 psi | 71% | 2877 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 94% | 35,186 psi | 55% | 2700 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,128 psi | 85% | 2940 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,004 psi | 67% | 2835 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,632 psi | 78% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,929 psi | 63% | 2743 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 40,785 psi | 64% | 2799 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,995 psi | 50% | 2582 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,865 psi | 50% | 2598 fps | 95.9% |
| Alliant Reloder-26 | 64.5 gr | 80% | 34,882 psi | 55% | 2717 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 40,437 psi | 63% | 2789 fps | 95.6% |
| Bofors RP30 | <<locked>> | 96% | 43,685 psi | 68% | 2890 fps | 96% |
| Bofors RP5 | <<locked>> | 86% | 40,785 psi | 64% | 2799 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 47,630 psi | 75% | 2831 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 94% | 43,018 psi | 67% | 2838 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 46,485 psi | 73% | 2877 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 49,110 psi | 77% | 2894 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 46,789 psi | 73% | 2867 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 45,963 psi | 72% | 2851 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,553 psi | 64% | 2717 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 37,869 psi | 59% | 2812 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 46,035 psi | 72% | 2897 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 1699 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,134 psi | 68% | 2759 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,965 psi | 77% | 2861 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 42,815 psi | 67% | 2772 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,382 psi | 71% | 2805 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 90% | 44,846 psi | 70% | 2897 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 46,543 psi | 73% | 2808 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 44,962 psi | 70% | 2795 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 32,735 psi | 51% | 2536 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 43,091 psi | 68% | 2792 fps | 96.2% |
| Norma 217 | <<locked>> | 98% | 35,795 psi | 56% | 2746 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 34,838 psi | 55% | 2684 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 44,077 psi | 69% | 2815 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 41,727 psi | 65% | 2838 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 42,902 psi | 67% | 2805 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 37,289 psi | 58% | 2710 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,253 psi | 44% | 1742 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,736 psi | 83% | 3009 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,715 psi | 70% | 2844 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,076 psi | 68% | 2861 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 34,780 psi | 55% | 2720 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 51,866 psi | 81% | 2900 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,295 psi | 69% | 2792 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 39,334 psi | 62% | 2726 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 47,630 psi | 75% | 2831 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,543 psi | 73% | 2808 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 44,962 psi | 70% | 2795 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,171 psi | 83% | 2956 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,982 psi | 81% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,687 psi | 72% | 2756 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,986 psi | 61% | 2723 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 51,576 psi | 81% | 2894 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,252 psi | 71% | 2779 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 40,930 psi | 64% | 2769 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,347 psi | 59% | 2651 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 49,458 psi | 78% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,382 psi | 71% | 2808 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 36,840 psi | 58% | 2635 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 44,788 psi | 70% | 2812 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,998 psi | 56% | 2664 fps | 98.8% |
| Vihtavuori N560 | <<locked>> | 88% | 46,267 psi | 73% | 2930 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 94% | 46,296 psi | 73% | 2913 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,512 psi | 70% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,702 psi | 73% | 2881 fps | 98.7% |
| Winchester StaBALL HD | 62 gr | 80% | 28,456 psi | 45% | 2582 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,160 psi | 61% | 2694 fps | 95.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 82 powders for 7 mm Weath. Mag. loaded with the .284 | 145gr | Speer Grand Slam. Winchester StaBALL HD delivers the highest muzzle velocity at 3,173 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,173 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Reloder-26, Accurate High Country, Winchester StaBALL HD rank at the top here: for 7 mm Weath. Mag. with the .284 | 145gr | Speer Grand Slam they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 7977 Enduron, IMR 8133 Enduron, Vihtavuori N170 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.